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  • Author or Editor: Travis C. Saveraid x
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Abstract

Objective—To describe pathological findings identified with MRI in the distal tarsal bones of horses with unilateral hind limb lameness attributable to tarsal pain and to compare the usefulness of MRI with that of radiography and nuclear scintigraphy in evaluation of this region.

Design—Retrospective case series.

Animals—20 lame horses.

Procedures—In all horses, MRI, radiography (4 standard projections), and nuclear scintigraphy of the tarsus had been performed. Horses were excluded if the results of all 3 imaging modalities were not available or if lameness was detected in more than 1 limb. Pathological changes identified with MRI were cross-referenced with the findings determined with other imaging modalities.

Results—Compared with MRI findings, the following lesions were identified with radiography: medullary and subchondral bone sclerosis in 9 of 16 horses, pathological changes related to osseous hyperintensity in 0 of 10 horses, and osteoarthritis in 5 of 8 horses. Standard radiographic projections did not aid in the identification of fracture of the distal tarsal bones (3 horses). Location of increased radiopharmaceutical uptake with nuclear scintigraphy corresponded with the location of pathological changes detected with MRI in all horses. The intensity of the radiopharmaceutical uptake on nuclear scintigraphic images did not correspond with the severity of the pathological changes identified with MRI.

Conclusions and Clinical Relevance—Radiography was unreliable for the detection of pathological changes related to osseous hyperintensity identified with MRI, fracture, and subchondral bone sclerosis in the equine tarsus. Nuclear scintigraphy was effective in localizing pathological changes, but MRI provided superior anatomic detail.

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in Journal of the American Veterinary Medical Association
History

An 8-year-old castrated male Bouvier des Flandres was referred for evaluation of swelling in the mandibular region on the right side. No abnormalities were detected during a dental procedure performed 2 months earlier. A mass measuring 5 × 3 × 2cm3 was palpated at the angle of the right ramus of the mandible. No lesions were visible in the oral cavity.Microscopic examination of fine-needle aspirates obtained from the mandibular mass revealed abundant melanin granules in a sparse, undefined cellular environment. These findings were interpreted as malignant melanoma of the mandibular salivary gland or regional lymph nodes. No

Restricted access
in Journal of the American Veterinary Medical Association